Supplemental Disclosures to Condensed Consolidated Statements of Cash Flows (Details) - USD ($) $ in Thousands	6 Months Ended
	Jul. 04, 2017	Jun. 28, 2016
Class of Stock [Line Items]
Interest paid (net of amounts capitalized)	$ 2,216	$ 860
Income taxes (refunded) paid	(60)	(42)
Changes in purchases of property and equipment accrued in accounts payable, net	$ 1,417	$ (873)
Common Stock | Common Class A
Class of Stock [Line Items]
Conversion of Series A convertible preferred stock to common stock	18,500,000	0